Pin for electrical work.



M. C. ROS ENFELD.

FIN FOR ELECTRICAL WORK.

APPLICATION FILED SEPT. 27. 1912.

Patented Mar. 28, 1916'.

THE COLUMBIA FLANOGRAPH cm, WASHINGTON. D. c

MORTIMER C. ROSENFELD, OF CLEVELAND, OHIO.

PIN FOR ELECTRICAL WORK.

Specification of Letters Patent.

Patented Mar. 28, 1916.

Application filed September'27, 1912. Serial No. 722,634.

To all whom it may concern:

Be it known that I, MORTIMER C. lRosnN- rnLo, a citizen of the United States, resident of Cleveland, county of Cuyahoga, and State of Ohio, have invented anew and useful Improvement in Pins for ElectricalVVork, of which the following is a specification, the principle of the invention being herein explained, and the best mode in which I have contemplated applying that principle, so as to distinguish it from other inventions.

My invention relates to devices for carrying the insulators which directly support the wires or cables carrying an electrical current, and which devices are themselves secured to the cross-arm of a supporting pole. These devices are usually referred to in the art as cross-arm pins.

The object of the invention is to provide a pin of the described character which may be economically manufactured and .which will be eflicient in its use.

The said invention consists of means hereinafter fully described and particularly pointed out in the claim.

In the annexed drawing :Figure 1 represents an axial section of a pin embodying my invention and Fig. 2 represents a bottom plan thereof.

The illustrated device comprises a main or body portion A of general frusto-conical construction and preferably hollow, of castiron, in the outer end of which is embedded, and thus securely fixed, a steel male-threaded member B. This member is so secured by casting the metal of the member A around its base, and providing a groove on in the latter for insuring its permanency of position. The male-thread is provided for the reception of the glass or porcelain insulator.

The opposite or inner end of the member A. is formed with the annular flange a and adjacent thereto is the transverse integral spider 4E. The middle of the latter is formed with the boss of extending toward but not reaching the plane of the face of said flange. This boss is formed with the internally threaded bore a for receiving the bolt C which secures the pin to the cross-arm D.

By means of the above-described construction, it will be seen that by providing the steel member B, all the advantages of the use of such metal is contained while the main structure is made of the cheaper iron capable of being readily cast, and since obviously the said member may be comparatively short, a. minimum amount of steel is used.

By providing the transverse and femalethreaded member a ready means are provided for fastening the whole pin securely to the cross-arn1,while at the same time only the face of the flange is in contact with the latter, thereby permitting the pin to be secured rigidly and so as to be devoid of movement or wabbling.

Having fully described my invention, what I claim and desire to obtain by Letters Patent is As a new article of manufacture, the combination of a unitary structure for electrical work comprising a hollow main conical member of cast metal and formed with an annular flange at its base; a male threaded member of steel having its base embodied in the metal of the outer end of said mainmember; a transverse spider cast integral with the latter, adjacent to but removed some distance inwardly from said base end; said spider being formed with a centrally located threaded bore co-aXial with said male threaded member.

Signed by me, this 16th day of September,

MORTIMER C. ROSENFELD. Attested by 7M. R. MILLER, A. E. MERKEL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). 0. 

